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automatically load to the runtime data structure, save to disk database, this is the process of initializing the proxysql running environment. If you do not start proxysql for the first time, because a disk database file already exists, Proxysql will read almost all of the configuration from the disk database (even if an item is configured in the traditional configuration file and will not parse), but there are 3 items that must be read from the traditional configuration file . These 3 items ar

the table Select_full_range_join Both The number of joins that use a range search in the referenced table. Select_range Both The number of joins that use a range in the first table. The general situation is not a critical issue, even if the value is quite large. Select_range_check Both The number of joins without a key value that are checked for key values after each row of data. If it is not 0, you should carefully chec

server Slave_received_heartbeats Global Number of heartbeats from the server Slave_retried_transactions Global Thread attempts to copy lines from the server since this startup Slave_running Global If the server is a slave server that is connected to the primary server, the value is on. Slow_launch_threads Both The number of threads that have been creat

, the other normal disk basically create 1 test directories, just 1/10 or fast 1/100 seconds or so of time, And I was surprised to find that there was a disk that took 5 minutes or so, and, more strangely, sometimes there will be times when there is no such phenomenon. Once a slow disk is present, it can seriously slow down the overall operational efficiency of the node, making the Node a slow node in the cluster and ultimately affecting the entire cluster. Then the problem comes, Now that the s

. The look of an ACK{ "command": "ack", // the id of the tuple to ack "id": "123123"} The look of Fail{ "command": "fail", // the id of the tuple to fail "id": "123123"} The look of log{ "command": "log", // the message to log "msg": "hello world!"} Handling heartbeats (version after 0.9.3) In storm0.9.3, the heartbeat has been used in shellspout or Shellbolt and their multi-lingual sub-

that is connected to Follower in the Zookeeper server cluster) Server) The maximum number of heartbeat intervals that can be tolerated when a connection is initialized. The client connection failed when the Zookeeper server has not received the return information of the client after 10 heartbeats (that is, ticktime) length. The total length of time is 5*2000=10 seconds. synclimit: This configuration item identifies the length of time that a messa

sounds like DNS, it really is. The difference is that this service discovery is used within your cluster to help service find each other. However, DNS is usually more static and is helping outside to request your service. At the same time, DNS servers and DNS protocols are not suitable for controlling the changing environment of microservices, and containers and nodes are often increased and decreased.Most of the service framework provides one or more choices to service discovery. By default, S

to the number it prepares to process, such as 100. Without any additional instructions, when 100 messages are available, it is delivered to the client (the server side decrements the RDY count for that client each time). The client library is designed to meet the configuration in RDY number Max-in-flightThe 25% sends a command to update the RDY count (and appropriately consider the connection to multiple NSQD cases, allocated appropriately). 2.5 Heartbeat and timeouts The TCP protocol for NSQ i

. Because PD stores an assignable time window in memory, the PD can calculate TSO directly in memory and return it when the TSO is requested outside.resp := pdpb.Timestamp{}for i := 0; i Because it is calculated in memory, so the performance is very high, our own internal testing can allocate millions other TSO per second. If the client requests TSO once per transaction to PD, the cost of each RPC is also very large, so the client will bulk get TSO for PD. The client first collects the TSO re

Master_SSL_Cipher The list of possible ciphers used in the handshake for the SSL connection 14 Ssl_key Master_SSL_Key The name of the SSL key file 15 Ssl_verify_server_cert Master_SSL_Verify_Server_Cert Whether to verify the server certificate 16 Heartbeat [None] Interval between replication heartbeats, in seconds 17 Bind Master_Bind Which of the slave's network interfaces shocould be used for connecting to the master 18 Ignored_server_ids Replicate_

the Zookeeper server, but the Leader that is connected to Follower in the Zookeeper server cluster) Server) The maximum number of heartbeat intervals that can be tolerated when a connection is initialized. The client connection failed when the Zookeeper server has not received the return information of the client after 10 heartbeats (that is, ticktime) length. The total length of time is 10*2000=20 seconds. Synclimit: This configuration item iden

=5synclimit=2server.1=192.168.211.1:2888:3888server.2=192.168.211.2:2888:3888 initlimit: This configuration item is used to configure Zookeeper accepts the client (the client here is not the client that connects the Zookeeper server, but the Follower server that is connected to Leader in the Zookeeper server cluster) The maximum number of heartbeat intervals that can be tolerated when the connection is initialized. The client connection failed when the Zookeeper server has not rece

probably the case: the ldap. so *** related to apr-util dependency is missing, which means that the ldap dependency is not compiled when you compile apr-util) Come on. Start the correct process. 1. Install OpenSSL Upgrade procedure 0. First, use # openssl version-a to view the OpenSSL version in the system. 1. Get the source package through # wget http://www.openssl.org/source/openssl-1.0.1g.tar.gz 2. Install openssl Tar xf openssl-1.0.1g.tar.gz Cd openssl-1.0.1g ./Config-DOPENSSL_NO_HEARTBEATS

Certificate Authority (CA) certificates 12 Ssl_cert Master_SSL_Cert The name of the SSL certificate file 13 Ssl_cipher Master_SSL_Cipher The list of possible ciphers used in the handshake for the SSL connection 14 Ssl_key Master_SSL_Key The name of the SSL key file 15 Ssl_verify_server_cert Master_SSL_Verify_Server_Cert Whether to verify the server certificate 16 Heartbeat [None] Interval between replicati

other is through the Disk Heartbeat of the Voting Disk. The two heartbeats have the maximum latency. For Disk Heartbeat, this latency is called IOT (I/O Timeout). For Network Heartbeat, this latency is called MC (Misscount ). These two parameters are measured in seconds. The missing time-saving IOT parameter is greater than MC. By default, these two parameters are automatically determined by Oracle and are not recommended to be adjusted. You can run

' dependencies, monitors their execution, and provides a set of servi CES to containers. Operators configure it to report memory, CPUs, and other resources available at this node and allocated for YARN. After registering with the RM, the NM heartbeats its status and receives instructionsNM as a working node. It is responsible for container leases, dependencies, viewing application execution, and providing services to the container. It reports the ava

other is through the Disk Heartbeat of the Voting Disk. The two heartbeats have the maximum latency. For Disk Heartbeat, this latency is called IOT (I/O Timeout). For Network Heartbeat, this latency is called MC (Misscount ). These two parameters are measured in seconds. The missing time-saving IOT parameter is greater than MC. By default, these two parameters are automatically determined by Oracle and are not recommended to be adjusted. You can run

the Voting Disk. The two heartbeats have the maximum latency. For Disk Heartbeat, this latency is called IOT (I/O Timeout). For Network Heartbeat, this latency is called MC (Misscount ). These two parameters are measured in seconds. The missing time-saving IOT parameter is greater than MC. By default, these two parameters are automatically determined by Oracle and are not recommended to be adjusted. You can run the following command to view the param

connection to set a timeout can be done, and in the Golang net package, there is no long-connected function, So we need to design and implement our own processing strategy for long connections. For Socke long connections, it is common practice to design a communication mechanism between the server and the socket, and when there is no information interaction between the two, the two parties will periodically send packets (heartbeats) to maintain the c

server supports SSL connections 10 Ssl_ca Master_ssl_ca_file The file used for the Certificate Authority (CA) Certificate 11 Ssl_capath Master_ssl_ca_path The path to the Certificate authority (CA) certificates 12 Ssl_cert Master_ssl_cert The name of the SSL certificate file 13 Ssl_cipher Master_ssl_cipher The list of possible ciphers used in the handshake for the SSL connection